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Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claims) (Details) (Asbestos Commitments And Contingencies [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Claim
Dec. 31, 2013
Claim
Dec. 31, 2012
Claim
Dec. 31, 2010
Claim
Dec. 30, 2009
Claim
Feb. 25, 2013
Activity Related to Asbestos Claims [Roll Forward]            
Beginning claims 51,490us-gaap_LossContingencyPendingClaimsNumber 56,442us-gaap_LossContingencyPendingClaimsNumber 58,658us-gaap_LossContingencyPendingClaimsNumber      
New claims 2,743us-gaap_LossContingencyNewClaimsFiledNumber 2,950us-gaap_LossContingencyNewClaimsFiledNumber 3,542us-gaap_LossContingencyNewClaimsFiledNumber      
Settlements (992)cr_LossContingencyClaimsSettlementsNumber (1,142)cr_LossContingencyClaimsSettlementsNumber 1,030cr_LossContingencyClaimsSettlementsNumber      
Dismissals (5,734)cr_LossContingencyClaimsDismissalsNumber (6,762)cr_LossContingencyClaimsDismissalsNumber 4,919cr_LossContingencyClaimsDismissalsNumber      
Number Of Activated Maritime Claims 0cr_NumberOfActivatedMaritimeClaims 2cr_NumberOfActivatedMaritimeClaims 191cr_NumberOfActivatedMaritimeClaims      
Ending claims 47,507us-gaap_LossContingencyPendingClaimsNumber 51,490us-gaap_LossContingencyPendingClaimsNumber 56,442us-gaap_LossContingencyPendingClaimsNumber      
Maritime actions       8cr_NumberOfNewMaritimeClaims    
Maritime Claims [Member]            
Activity Related to Asbestos Claims [Roll Forward]            
Total number of maritime claims         36,448cr_TotalNumberOfMaritimeClaims
/ cr_CommitmentsAndContingenciesAxis
= cr_AsbestosCommitmentsAndContingenciesMember
/ us-gaap_LitigationCaseAxis
= cr_MaritimeClaimsMember		  
Thomas Amato [Member]            
Loss Contingencies [Line Items]            
Jury Verdict           $ 2,500,000cr_JuryVerdict
/ cr_CommitmentsAndContingenciesAxis
= cr_AsbestosCommitmentsAndContingenciesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= cr_ThomasAmatoMember